List Mg hiearchy

Get-AzMgHiearchy

function Get-AzMgHierarchy {
    [cmdletbinding()]
    param (
        [string]$mgGroupId
    )
 
    # Getting Azure connection context for the signed in user
    $currentContext = Get-AzContext
 
    # fetching new token
    $azureRmProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
    $profileClient = [Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient]::new($azureRmProfile)
    $token = $profileClient.AcquireAccessToken($currentContext.Subscription.TenantId)
 
    # Listing All Subscriptions to grab their tenantId's
    $listDescendants = @{
        Uri = "https://management.azure.com/providers/Microsoft.Management/managementGroups/$($mgGroupId)/descendants?api-version=2018-03-01-preview"
        Headers = @{
            Authorization = "Bearer $($token.AccessToken)"
            'Content-Type' = 'application/json'
        }
        Method = 'GET'
    }
    $list = Invoke-RestMethod @listDescendants
    $list.value
}